Advanced Indoor Culling with Portal Occluder
Optimizing complex indoor environments requires more than standard frustum culling. Using Portal Occluder Unity 2.0.0, we can implement a robust room-and-portal system that significantly reduces draw calls by preventing the engine from rendering geometry hidden behind walls. Unlike Unity’s built-in occlusion culling which relies on baked data, this library allows for dynamic graph construction, making it viable for procedural generation and runtime level loading.
Integration Tips
- Volume vs. Hierarchy: When setting up your scene, use the volume-based approach for organic shapes, but stick to the hierarchy-based method for modular kits to keep your scene graph clean.
- Runtime Generation: If you are building a dungeon crawler, ensure your room instantiation logic calls the graph rebuild function only after the full layout is placed to avoid frame spikes during the bake process.
- Layer Management: Assign your static environment meshes to a specific layer so the portal system doesn’t waste cycles calculating occlusion for small dynamic props that won’t block the camera anyway.
Best Use Cases
1. Procedural Dungeon Crawlers
The dynamic construction feature is a lifeworker for Roguelikes. Since you can connect rooms at runtime, you can maintain high performance in sprawling, randomized layouts where traditional pre-baked occlusion would be impossible.
2. High-Fidelity Architectural Visualizations
In scenes with high-poly interior assets (like the provided Victorian Mansion demo), this asset ensures that only the visible room is processed by the GPU, freeing up the frame budget for expensive SRP shaders and real-time lighting.